C4 Picasso 2008 diesel. Rear Indicator Lights

[g4v1nf]

Hi all, I'm hoping someone can point me in the right direction for some replacement parts:

My rear passenger side indicator isn't working. On inspection, the earth pin has corroded out and is causing the issue, but I cannot find a replacement connector anywhere.

I've searched through my fave go-to: eBay and Google, but all I can find is 6-pin connectors when mine is a 4-pin.

Sorry if it's obvious, but I'm clueless at this point.

Thanks for any replies